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MVANA (Hylodendron gabunense)

Trade Name

Mvana

Scientific Name

Hylodendron gabunense Taub.

Family

LEGUMINOSAE

Common Names

Ighozo (Nigeria); Erikesi (Nigeria); Mvana (Gabon); Sesingui (Congo); Panpando (Cameroon); Mvanda (Cameroon); Lando (Cameroon); Alane (Cameroon)

Description Of The Tree

Botanical Description

The tree reaches a height of more than 50 m. The boles may be up to 26 m in length, cylindrical, straight and clear. Numerous lox and thin buttresses are present. The trunk diameter attains 100 up to 170 cm.

Natural Habitat

Hylodendron gabunense occurs in secondary formations, rarely in small groups in dense forest. Also found in small groups on abandoned cultivated fields.

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Wood Identification

Anatomic Description Of Wood

Wood diffuse porous. Occasionally vessels exclusively solitary (over 90%). Tangential diameter of vessel lumina 100 to 150 micras (small). Vestured pits. Vessels per mm2 10 to 20 (abundant). Simple perforation plates. Vessel-ray pits similar to intervessel pits Axial parenchyma in marginal or in seemingly marginal bands. Axial parenchyma aliform. Occasionally axial parenchyma confluent. Prismatic crystals in chambered axial parenchyma cells and/or in fibers. 3 to 4 cells per parenchyma strand. Rays more than 10 per mm (abundant). Rays non-storied. Rays exclusively uniseriate. Body ray cells procumbent with one row of upright and/or square marginal cells (Kribs-III). Non-septate fibers. Fibers with simple to minutely bordered pits.

Availability

Cites Status

Unrestricted

General Wood Description

Color

The heartwood is pale brown with an occasional pink tinge, it is not clearly demarcated.

Grain

Straight; grain has no particular influence on drying, machining and finishing qualities.

Texture

The wood is typically fine in texture.

Natural Durability

Not durable; important risks of decay attacks at any processing step, from logs up to final products. It must receive preservative treatment.

Natural durability index (1= Very high durability, 7=Vey low durability)

5

Wood Physical Properties

Basic Density or Specific Gravity (O.D. weight/vol. green) (g/cm³)

0.78

Air-dry Density (Weight and volume at 12%MC) (g/cm³)

0.89

Total shrinkage Tangential (Saturated to 0%MC) (%)

9.3

Total shrinkage Radial (Saturated to 0%MC) (%)

5.6

Drying Defects

Ease of Drying: Drying is very slow and difficult to perform; defects are frequent. Drying Defects: Risks of checks and distortions. Kiln Schedules: Schedule proposed as a reference by comparison with well known species taking into account to the general technological behavior of this species.

Dimensional stability ratio (Total Tangential Shrinkage %/Total Radial Shrinkage %)

1.7

Wood Chemical Properties

Wood Mechanical Properties

Bending Strength (MOR),12%MC (kgf/cm²)

1776

Stiffness (MOE) 12%MC (kgf/cm²)

220723

Compression parallel to fiber 12%MC (kgf/cm²)

928

Compression perpendicular to fiber 12%MC (kgf/cm²)

142

Shear strength radial 12%MC (kgf/cm²)

107

Janka hardness (side) 12%MC (kgf)

994

Janka hardness (end grain) 12%MC (kgf)

1041

Workability

Sawing

Sawing of this species requires powerful equipment.

Rotary Veneer Cutting

Not suitable for veneering.

Sliced Veneer

Not suitable for veneering.

Blunting Effect

Moderate blunting effect; stellited blades for sawing and carbide tools for machining are advised.

Machining

It needs powerful tools for processing. Possible difficulties caused by interlocked grain are reported.

Planing

Moderately easy; tools must be cautiously sharpened.

Moulding

Easy; no particular problems.

Turning

30

Boring

Easy; no particular problems.

Mortising

Easy; no particular problems.

Nailing

Pre-boring is necessary.

Gluing

Difficult to glue because of high density.

Sanding

Easy to perform; it gives good results.

Polishing

Can be polished without surface preparation.

Response To Hand Tools

Working with hand tools is difficult.

REFERENCED USES

End Uses Summary

HOUSING GENERAL, parquet, fittings, FURNITURE AND CABINETS, cabinets, TURNING, SPORTS, TOOLS, tool handles, agricultural tools, CONTAINERS, truck bodies, truck flooring, NAVAL CONSTRUCTION, boats, OTHER AND MUSICAL INSTRUMENTS, handicrafts

General Housing
  • 10 - Silica in Timbers
Parquet
  • 15 - Empire Timbers
Fittings
  • 19 - Silica in Timbers
Furniture Cabinets
  • 21 - Tropical timbers of the world. Part III-Southeast Asian and Oceanian Species.
Cabinet
  • 24 - Empire Timbers
Turning
  • 30 - Embassy of Honduras in Japan
Sports
  • 38 - Annual Review and Assessment of the World Timber Situation 1998-ITTO
Tools
  • 42 - Utilización Industrial de Nuevas Especies Forestales en el Perú.
Tool Handles
  • 43 - Maderas de Bolivia (Características y Usos de 55 Maderas Tropicales)
Agricultural Tools
  • 44 - Atlas of Peruvian Woods
Truck Body
  • 53 - Timbers of the New World
Truck Flooring
  • 54 - Bulletin of the Government Forest Experiment Station N.157: Identification of Tropical Woods
Shipbuilding
  • 55 - Tropical Timber Atlas of Latin America
Boats
  • 56 - Manual de Identificación de Especies Forestales de la Subregión Andina.
Handcraft
  • 66 - Maderas latinoamericanas. VII. Caracteristicas anatomicas. propiedades fisicomecanicas, de secado, y tratabilidad de la madera juvenil de Cordia alliodora (Ruiz & Pav. Oken.)

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